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Yvon Perret Sock
 The Yvon Perret Sock hang glider appeared in 1985.
The Sock 3 was for advanced pilots.
 Sock 2 – pilot Alain Jacques
The manufacturer and pilot tester of the Sock 2 is Alain Jacques. After a few tests on the slope school, he had taken off directly from the north hill in St Hil.
Sock 2
Wing area: 15.21 m²
Wing span: 11.6 m
Aspect ratio: 8.8
Hang glider weight: 36 kg
Packed length: 3 m
Nose angle: 138°
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